Method And Apparatus For Creating Map Data And Method And Apparatus For Route Search
a map data and mapping technology, applied in maps/plans/charts, navigation instruments, maps, etc., can solve the problems of increasing communication costs, large amount of difference data of exclusive networks, large data size of road information, etc., to reduce the size of difference data used when the map is updated, narrow down the search range, and reduce the effect of communication cos
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[0039]FIG. 1 is an illustration of road information included in map data according to the present invention. A plurality of levels (levels 1 to 4) corresponding to levels of detail are set, meshes at the individual levels are stratified, and road information is constructed of road information RI1 to RI4 of the individual meshes at the individual levels and search range data SRD that is used when a route search is performed.
[0040]Level 1 is a part for identifying map information of roads subject to guidance and roads not subject to guidance. Level 2 is a part for identifying road information of roads subject to guidance. Level 3 is a part for identifying map information of main roads. Level 4 is a part for identifying map information of superior main roads (prefectural roads, national roads, and expressways).
[0041]The search range data SRD in the map data includes, for the combination of two particular meshes M1 and M2 at a predetermined level (for example...
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